diff options
Diffstat (limited to 'lib/sha256.c')
-rw-r--r-- | lib/sha256.c | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/lib/sha256.c b/lib/sha256.c new file mode 100644 index 0000000..0b94581 --- /dev/null +++ b/lib/sha256.c @@ -0,0 +1,369 @@ +/* + * FIPS-180-2 compliant SHA-256 implementation + * + * Copyright (C) 2001-2003 Christophe Devine + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <string.h> + +#include "sha256.h" + +#define GET_UINT32(n,b,i) \ +{ \ + (n) = ( (uint32) (b)[(i) ] << 24 ) \ + | ( (uint32) (b)[(i) + 1] << 16 ) \ + | ( (uint32) (b)[(i) + 2] << 8 ) \ + | ( (uint32) (b)[(i) + 3] ); \ +} + +#define PUT_UINT32(n,b,i) \ +{ \ + (b)[(i) ] = (uint8) ( (n) >> 24 ); \ + (b)[(i) + 1] = (uint8) ( (n) >> 16 ); \ + (b)[(i) + 2] = (uint8) ( (n) >> 8 ); \ + (b)[(i) + 3] = (uint8) ( (n) ); \ +} + +void sha256_starts( sha256_context *ctx ) +{ + ctx->total[0] = 0; + ctx->total[1] = 0; + + ctx->state[0] = 0x6A09E667; + ctx->state[1] = 0xBB67AE85; + ctx->state[2] = 0x3C6EF372; + ctx->state[3] = 0xA54FF53A; + ctx->state[4] = 0x510E527F; + ctx->state[5] = 0x9B05688C; + ctx->state[6] = 0x1F83D9AB; + ctx->state[7] = 0x5BE0CD19; +} + +void sha256_process( sha256_context *ctx, uint8 data[64] ) +{ + uint32 temp1, temp2, W[64]; + uint32 A, B, C, D, E, F, G, H; + + GET_UINT32( W[0], data, 0 ); + GET_UINT32( W[1], data, 4 ); + GET_UINT32( W[2], data, 8 ); + GET_UINT32( W[3], data, 12 ); + GET_UINT32( W[4], data, 16 ); + GET_UINT32( W[5], data, 20 ); + GET_UINT32( W[6], data, 24 ); + GET_UINT32( W[7], data, 28 ); + GET_UINT32( W[8], data, 32 ); + GET_UINT32( W[9], data, 36 ); + GET_UINT32( W[10], data, 40 ); + GET_UINT32( W[11], data, 44 ); + GET_UINT32( W[12], data, 48 ); + GET_UINT32( W[13], data, 52 ); + GET_UINT32( W[14], data, 56 ); + GET_UINT32( W[15], data, 60 ); + +#define SHR(x,n) ((x & 0xFFFFFFFF) >> n) +#define ROTR(x,n) (SHR(x,n) | (x << (32 - n))) + +#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3)) +#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10)) + +#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22)) +#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25)) + +#define F0(x,y,z) ((x & y) | (z & (x | y))) +#define F1(x,y,z) (z ^ (x & (y ^ z))) + +#define R(t) \ +( \ + W[t] = S1(W[t - 2]) + W[t - 7] + \ + S0(W[t - 15]) + W[t - 16] \ +) + +#define P(a,b,c,d,e,f,g,h,x,K) \ +{ \ + temp1 = h + S3(e) + F1(e,f,g) + K + x; \ + temp2 = S2(a) + F0(a,b,c); \ + d += temp1; h = temp1 + temp2; \ +} + + A = ctx->state[0]; + B = ctx->state[1]; + C = ctx->state[2]; + D = ctx->state[3]; + E = ctx->state[4]; + F = ctx->state[5]; + G = ctx->state[6]; + H = ctx->state[7]; + + P( A, B, C, D, E, F, G, H, W[ 0], 0x428A2F98 ); + P( H, A, B, C, D, E, F, G, W[ 1], 0x71374491 ); + P( G, H, A, B, C, D, E, F, W[ 2], 0xB5C0FBCF ); + P( F, G, H, A, B, C, D, E, W[ 3], 0xE9B5DBA5 ); + P( E, F, G, H, A, B, C, D, W[ 4], 0x3956C25B ); + P( D, E, F, G, H, A, B, C, W[ 5], 0x59F111F1 ); + P( C, D, E, F, G, H, A, B, W[ 6], 0x923F82A4 ); + P( B, C, D, E, F, G, H, A, W[ 7], 0xAB1C5ED5 ); + P( A, B, C, D, E, F, G, H, W[ 8], 0xD807AA98 ); + P( H, A, B, C, D, E, F, G, W[ 9], 0x12835B01 ); + P( G, H, A, B, C, D, E, F, W[10], 0x243185BE ); + P( F, G, H, A, B, C, D, E, W[11], 0x550C7DC3 ); + P( E, F, G, H, A, B, C, D, W[12], 0x72BE5D74 ); + P( D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE ); + P( C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7 ); + P( B, C, D, E, F, G, H, A, W[15], 0xC19BF174 ); + P( A, B, C, D, E, F, G, H, R(16), 0xE49B69C1 ); + P( H, A, B, C, D, E, F, G, R(17), 0xEFBE4786 ); + P( G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6 ); + P( F, G, H, A, B, C, D, E, R(19), 0x240CA1CC ); + P( E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F ); + P( D, E, F, G, H, A, B, C, R(21), 0x4A7484AA ); + P( C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC ); + P( B, C, D, E, F, G, H, A, R(23), 0x76F988DA ); + P( A, B, C, D, E, F, G, H, R(24), 0x983E5152 ); + P( H, A, B, C, D, E, F, G, R(25), 0xA831C66D ); + P( G, H, A, B, C, D, E, F, R(26), 0xB00327C8 ); + P( F, G, H, A, B, C, D, E, R(27), 0xBF597FC7 ); + P( E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3 ); + P( D, E, F, G, H, A, B, C, R(29), 0xD5A79147 ); + P( C, D, E, F, G, H, A, B, R(30), 0x06CA6351 ); + P( B, C, D, E, F, G, H, A, R(31), 0x14292967 ); + P( A, B, C, D, E, F, G, H, R(32), 0x27B70A85 ); + P( H, A, B, C, D, E, F, G, R(33), 0x2E1B2138 ); + P( G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC ); + P( F, G, H, A, B, C, D, E, R(35), 0x53380D13 ); + P( E, F, G, H, A, B, C, D, R(36), 0x650A7354 ); + P( D, E, F, G, H, A, B, C, R(37), 0x766A0ABB ); + P( C, D, E, F, G, H, A, B, R(38), 0x81C2C92E ); + P( B, C, D, E, F, G, H, A, R(39), 0x92722C85 ); + P( A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1 ); + P( H, A, B, C, D, E, F, G, R(41), 0xA81A664B ); + P( G, H, A, B, C, D, E, F, R(42), 0xC24B8B70 ); + P( F, G, H, A, B, C, D, E, R(43), 0xC76C51A3 ); + P( E, F, G, H, A, B, C, D, R(44), 0xD192E819 ); + P( D, E, F, G, H, A, B, C, R(45), 0xD6990624 ); + P( C, D, E, F, G, H, A, B, R(46), 0xF40E3585 ); + P( B, C, D, E, F, G, H, A, R(47), 0x106AA070 ); + P( A, B, C, D, E, F, G, H, R(48), 0x19A4C116 ); + P( H, A, B, C, D, E, F, G, R(49), 0x1E376C08 ); + P( G, H, A, B, C, D, E, F, R(50), 0x2748774C ); + P( F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5 ); + P( E, F, G, H, A, B, C, D, R(52), 0x391C0CB3 ); + P( D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A ); + P( C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F ); + P( B, C, D, E, F, G, H, A, R(55), 0x682E6FF3 ); + P( A, B, C, D, E, F, G, H, R(56), 0x748F82EE ); + P( H, A, B, C, D, E, F, G, R(57), 0x78A5636F ); + P( G, H, A, B, C, D, E, F, R(58), 0x84C87814 ); + P( F, G, H, A, B, C, D, E, R(59), 0x8CC70208 ); + P( E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA ); + P( D, E, F, G, H, A, B, C, R(61), 0xA4506CEB ); + P( C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7 ); + P( B, C, D, E, F, G, H, A, R(63), 0xC67178F2 ); + + ctx->state[0] += A; + ctx->state[1] += B; + ctx->state[2] += C; + ctx->state[3] += D; + ctx->state[4] += E; + ctx->state[5] += F; + ctx->state[6] += G; + ctx->state[7] += H; +} + +void sha256_update( sha256_context *ctx, uint8 *input, uint32 length ) +{ + uint32 left, fill; + + if( ! length ) return; + + left = ctx->total[0] & 0x3F; + fill = 64 - left; + + ctx->total[0] += length; + ctx->total[0] &= 0xFFFFFFFF; + + if( ctx->total[0] < length ) + ctx->total[1]++; + + if( left && length >= fill ) + { + memcpy( (void *) (ctx->buffer + left), + (void *) input, fill ); + sha256_process( ctx, ctx->buffer ); + length -= fill; + input += fill; + left = 0; + } + + while( length >= 64 ) + { + sha256_process( ctx, input ); + length -= 64; + input += 64; + } + + if( length ) + { + memcpy( (void *) (ctx->buffer + left), + (void *) input, length ); + } +} + +static uint8 sha256_padding[64] = +{ + 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; + +void sha256_finish( sha256_context *ctx, uint8 digest[32] ) +{ + uint32 last, padn; + uint32 high, low; + uint8 msglen[8]; + + high = ( ctx->total[0] >> 29 ) + | ( ctx->total[1] << 3 ); + low = ( ctx->total[0] << 3 ); + + PUT_UINT32( high, msglen, 0 ); + PUT_UINT32( low, msglen, 4 ); + + last = ctx->total[0] & 0x3F; + padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last ); + + sha256_update( ctx, sha256_padding, padn ); + sha256_update( ctx, msglen, 8 ); + + PUT_UINT32( ctx->state[0], digest, 0 ); + PUT_UINT32( ctx->state[1], digest, 4 ); + PUT_UINT32( ctx->state[2], digest, 8 ); + PUT_UINT32( ctx->state[3], digest, 12 ); + PUT_UINT32( ctx->state[4], digest, 16 ); + PUT_UINT32( ctx->state[5], digest, 20 ); + PUT_UINT32( ctx->state[6], digest, 24 ); + PUT_UINT32( ctx->state[7], digest, 28 ); +} + +#ifdef TEST + +#include <stdlib.h> +#include <stdio.h> + +/* + * those are the standard FIPS-180-2 test vectors + */ + +static char *msg[] = +{ + "abc", + "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", + NULL +}; + +static char *val[] = +{ + "ba7816bf8f01cfea414140de5dae2223" \ + "b00361a396177a9cb410ff61f20015ad", + "248d6a61d20638b8e5c026930c3e6039" \ + "a33ce45964ff2167f6ecedd419db06c1", + "cdc76e5c9914fb9281a1c7e284d73e67" \ + "f1809a48a497200e046d39ccc7112cd0" +}; + +int main( int argc, char *argv[] ) +{ + FILE *f; + int i, j; + char output[65]; + sha256_context ctx; + unsigned char buf[1000]; + unsigned char sha256sum[32]; + + if( argc < 2 ) + { + printf( "\n SHA-256 Validation Tests:\n\n" ); + + for( i = 0; i < 3; i++ ) + { + printf( " Test %d ", i + 1 ); + + sha256_starts( &ctx ); + + if( i < 2 ) + { + sha256_update( &ctx, (uint8 *) msg[i], + strlen( msg[i] ) ); + } + else + { + memset( buf, 'a', 1000 ); + + for( j = 0; j < 1000; j++ ) + { + sha256_update( &ctx, (uint8 *) buf, 1000 ); + } + } + + sha256_finish( &ctx, sha256sum ); + + for( j = 0; j < 32; j++ ) + { + sprintf( output + j * 2, "%02x", sha256sum[j] ); + } + + if( memcmp( output, val[i], 64 ) ) + { + printf( "failed!\n" ); + return( 1 ); + } + + printf( "passed.\n" ); + } + + printf( "\n" ); + } + else + { + if( ! ( f = fopen( argv[1], "rb" ) ) ) + { + perror( "fopen" ); + return( 1 ); + } + + sha256_starts( &ctx ); + + while( ( i = fread( buf, 1, sizeof( buf ), f ) ) > 0 ) + { + sha256_update( &ctx, buf, i ); + } + + sha256_finish( &ctx, sha256sum ); + + for( j = 0; j < 32; j++ ) + { + printf( "%02x", sha256sum[j] ); + } + + printf( " %s\n", argv[1] ); + } + + return( 0 ); +} + +#endif |